Abstract
Winding losses in electric machines consist of ohmic DC losses and AC eddy losses. AC losses in SRM windings are often neglected in the design process, due to the lack of analytic equations and in case of finite element analysis (FEA), complex geometries and long simulation times. Because of the open slot geometry of SRM, stray fields penetrate deep into the stator slot and cause high additional AC losses, which need to be accounted for and mitigated in the design stage. In case of stranded windings, conductor bundle shape and placement of individual conductors in the bundle also have significant effect on resulting AC losses. Because of nonlinear behavior of magnetic circuit, time stepping 2D FEA with moving band to perform the rotor motion is used. FEA analysis shows the AC and DC loss components in different winding configurations of the 8/6 SRM.
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